The version of NTP installed on the remote AIX host is affected by the following vulnerabilities :

  - A flaw exists in the receive() function due to the use     of authenticated broadcast mode. A man-in-the-middle     attacker can exploit this to conduct a replay attack.
    (CVE-2015-7973)

  - A NULL pointer dereference flaw exists in ntp_request.c     that is triggered when handling ntpdc relist commands.
    A remote attacker can exploit this, via a specially     crafted request, to crash the service, resulting in a     denial of service condition. (CVE-2015-7977)

  - An unspecified flaw exists in authenticated broadcast     mode. A remote attacker can exploit this, via specially     crafted packets, to cause a denial of service condition.
    (CVE-2015-7979)

  - A flaw exists in ntpq and ntpdc that allows a remote     attacker to disclose sensitive information in     timestamps. (CVE-2015-8139)

  - A flaw exists in the ntpq protocol that is triggered     during the handling of an improper sequence of numbers.
    A man-in-the-middle attacker can exploit this to conduct     a replay attack. (CVE-2015-8140)

  - A flaw exists in the ntpq client that is triggered when     handling packets that cause a loop in the getresponse()     function. A remote attacker can exploit this to cause an     infinite loop, resulting in a denial of service     condition. (CVE-2015-8158)

Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs :

  - CVE-2015-7974     Matt Street discovered that insufficient key validation     allows impersonation attacks between authenticated     peers.

  - CVE-2015-7977 CVE-2015-7978     Stephen Gray discovered that a NULL pointer dereference     and a buffer overflow in the handling of 'ntpdc reslist'     commands may result in denial of service.

  - CVE-2015-7979     Aanchal Malhotra discovered that if NTP is configured     for broadcast mode, an attacker can send malformed     authentication packets which break associations with the     server for other broadcast clients.

  - CVE-2015-8138     Matthew van Gundy and Jonathan Gardner discovered that     missing validation of origin timestamps in ntpd clients     may result in denial of service.

  - CVE-2015-8158     Jonathan Gardner discovered that missing input     sanitising in ntpq may result in denial of service.

  - CVE-2016-1547     Stephen Gray and Matthew van Gundy discovered that     incorrect handling of crypto NAK packets may result in     denial of service.

  - CVE-2016-1548     Jonathan Gardner and Miroslav Lichvar discovered that     ntpd clients could be forced to change from basic     client/server mode to interleaved symmetric mode,     preventing time synchronisation.

  - CVE-2016-1550     Matthew van Gundy, Stephen Gray and Loganaden Velvindron     discovered that timing leaks in the packet     authentication code could result in recovery of a     message digest.

  - CVE-2016-2516     Yihan Lian discovered that duplicate IPs on 'unconfig'     directives will trigger an assert.

  - CVE-2016-2518     Yihan Lian discovered that an OOB memory access could     potentially crash ntpd.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3096-1 advisory.

    Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker     could use this issue to perform a replay attack. (CVE-2015-7973)

    Matt Street discovered that NTP incorrectly verified peer associations of symmetric keys. A remote     attacker could use this issue to perform an impersonation attack. (CVE-2015-7974)

    Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled memory. An attacker could     possibly use this issue to cause ntpq to crash, resulting in a denial of service. This issue only affected     Ubuntu 16.04 LTS. (CVE-2015-7975)

    Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled dangerous characters in     filenames. An attacker could possibly use this issue to overwrite arbitrary files. (CVE-2015-7976)

    Stephen Gray discovered that NTP incorrectly handled large restrict lists. An attacker could use this     issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7977, CVE-2015-7978)

    Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker     could use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7979)

    Jonathan Gardner discovered that NTP incorrectly handled origin timestamp checks. A remote attacker could     use this issue to spoof peer servers. (CVE-2015-8138)

    Jonathan Gardner discovered that the NTP ntpq utility did not properly handle certain incorrect values. An     attacker could possibly use this issue to cause ntpq to hang, resulting in a denial of service.
    (CVE-2015-8158)

    It was discovered that the NTP cronjob incorrectly cleaned up the statistics directory. A local attacker     could possibly use this to escalate privileges. (CVE-2016-0727)

    Stephen Gray and Matthew Van Gundy discovered that NTP incorrectly validated crypto-NAKs. A remote     attacker could possibly use this issue to prevent clients from synchronizing. (CVE-2016-1547)

    Miroslav Lichvar and Jonathan Gardner discovered that NTP incorrectly handled switching to interleaved     symmetric mode. A remote attacker could possibly use this issue to prevent clients from synchronizing.
    (CVE-2016-1548)

    Matthew Van Gundy, Stephen Gray and Loganaden Velvindron discovered that NTP incorrectly handled message     authentication. A remote attacker could possibly use this issue to recover the message digest key.
    (CVE-2016-1550)

    Yihan Lian discovered that NTP incorrectly handled duplicate IPs on unconfig directives. An authenticated     remote attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service.
    (CVE-2016-2516)

    Yihan Lian discovered that NTP incorrectly handled certail peer associations. A remote attacker could     possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2016-2518)

    Jakub Prokes discovered that NTP incorrectly handled certain spoofed packets. A remote attacker could     possibly use this issue to cause a denial of service. (CVE-2016-4954)

    Miroslav Lichvar discovered that NTP incorrectly handled certain packets when autokey is enabled. A remote     attacker could possibly use this issue to cause a denial of service. (CVE-2016-4955)

    Miroslav Lichvar discovered that NTP incorrectly handled certain spoofed broadcast packets. A remote     attacker could possibly use this issue to cause a denial of service. (CVE-2016-4956)

    In the default installation, attackers would be isolated by the NTP AppArmor profile.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the ntp packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - It was found that when ntp is configured with rate     limiting for all associations the limits are also     applied to responses received from its configured     sources. A remote attacker who knows the sources can     cause a denial of service by preventing ntpd from     accepting valid responses from its     sources.(CVE-2016-7426)

  - ntpq in NTP before 4.2.8p7 allows remote attackers to     obtain origin timestamps and then impersonate peers via     unspecified vectors.(CVE-2015-8139)

  - A NULL pointer dereference flaw was found in the way     ntpd processed 'ntpdc reslist' commands that queried     restriction lists with a large amount of entries. A     remote attacker could potentially use this flaw to     crash ntpd.(CVE-2015-7977)

  - A vulnerability was found in NTP, in the parsing of     packets from the /dev/datum device. A malicious device     could send crafted messages, causing ntpd to     crash.(CVE-2017-6462)

  - The process_packet function in ntp_proto.c in ntpd in     NTP 4.x before 4.2.8p8 allows remote attackers to cause     a denial of service (peer-variable modification) by     sending spoofed packets from many source IP addresses     in a certain scenario, as demonstrated by triggering an     incorrect leap indication.(CVE-2016-4954)

  - It was found that ntpd could crash due to an     uninitialized variable when processing malformed     logconfig configuration commands.(CVE-2015-5194)

  - It was discovered that the sntp utility could become     unresponsive due to being caught in an infinite loop     when processing a crafted NTP packet.(CVE-2015-5219)

  - It was discovered that ntpd as a client did not     correctly check the originate timestamp in received     packets. A remote attacker could use this flaw to send     a crafted packet to an ntpd client that would     effectively disable synchronization with the server, or     push arbitrary offset/delay measurements to modify the     time on the client.(CVE-2015-8138)

  - It was found that the fix for CVE-2014-9750 was     incomplete: three issues were found in the value length     checks in NTP's ntp_crypto.c, where a packet with     particular autokey operations that contained malicious     data was not always being completely validated. A     remote attacker could use a specially crafted NTP     packet to crash ntpd.(CVE-2015-7702)

  - Multiple buffer overflow flaws were discovered in     ntpd's crypto_recv(), ctl_putdata(), and configure()     functions. A remote attacker could use either of these     flaws to send a specially crafted request packet that     could crash ntpd or, potentially, execute arbitrary     code with the privileges of the ntp user. Note: the     crypto_recv() flaw requires non default configurations     to be active, while the ctl_putdata() flaw, by default,     can only be exploited via local attackers, and the     configure() flaw requires additional authentication to     exploit.(CVE-2014-9295)

  - It was found that an ntpd client could be forced to     change from basic client/server mode to the interleaved     symmetric mode. A remote attacker could use a spoofed     packet that, when processed by an ntpd client, would     cause that client to reject all future legitimate     server responses, effectively disabling time     synchronization on that client.(CVE-2016-1548)

  - A flaw was found in the way NTP's libntp performed     message authentication. An attacker able to observe the     timing of the comparison function used in packet     authentication could potentially use this flaw to     recover the message digest.(CVE-2016-1550)

  - A denial of service flaw was found in the way NTP     handled preemptable client associations. A remote     attacker could send several crypto NAK packets to a     victim client, each with a spoofed source address of an     existing associated peer, preventing that client from     synchronizing its time.(CVE-2016-1547)

  - It was found that the fix for CVE-2014-9750 was     incomplete: three issues were found in the value length     checks in NTP's ntp_crypto.c, where a packet with     particular autokey operations that contained malicious     data was not always being completely validated. A     remote attacker could use a specially crafted NTP     packet to crash ntpd.(CVE-2015-7692)

  - A flaw was found in the way the ntpq client processed     certain incoming packets in a loop in the getresponse()     function. A remote attacker could potentially use this     flaw to crash an ntpq client instance.(CVE-2015-8158)

  - It was discovered that ntpd as a client did not     correctly check timestamps in Kiss-of-Death packets. A     remote attacker could use this flaw to send a crafted     Kiss-of-Death packet to an ntpd client that would     increase the client's polling interval value, and     effectively disable synchronization with the     server.(CVE-2015-7704)

  - A flaw was found in the control mode functionality of     ntpd. A remote attacker could send a crafted control     mode packet which could lead to information disclosure     or result in DDoS amplification attacks.(CVE-2016-9310)

  - A vulnerability was discovered in the NTP server's     parsing of configuration directives. A remote,     authenticated attacker could cause ntpd to crash by     sending a crafted message.(CVE-2017-6464)

  - It was found that ntpd automatically generated weak     keys for its internal use if no ntpdc request     authentication key was specified in the ntp.conf     configuration file. A remote attacker able to match the     configured IP restrictions could guess the generated     key, and possibly use it to send ntpdc query or     configuration requests.(CVE-2014-9293)

  - A denial of service flaw was found in the way NTP hosts     that were peering with each other authenticated     themselves before updating their internal state     variables. An attacker could send packets to one peer     host, which could cascade to other peers, and stop the     synchronization process among the reached     peers.(CVE-2015-1799)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for ntp fixes the following issues :

  - Update to 4.2.8p7 (boo#977446) :

  - CVE-2016-1547, boo#977459: Validate crypto-NAKs, AKA:
    CRYPTO-NAK DoS.

  - CVE-2016-1548, boo#977461: Interleave-pivot

  - CVE-2016-1549, boo#977451: Sybil vulnerability:
    ephemeral association attack.

  - CVE-2016-1550, boo#977464: Improve NTP security against     buffer comparison timing attacks.

  - CVE-2016-1551, boo#977450: Refclock impersonation     vulnerability

  - CVE-2016-2516, boo#977452: Duplicate IPs on unconfig     directives will cause an assertion botch in ntpd.

  - CVE-2016-2517, boo#977455: remote configuration     trustedkey/ requestkey/controlkey values are not     properly validated.

  - CVE-2016-2518, boo#977457: Crafted addpeer with hmode >     7 causes array wraparound with MATCH_ASSOC.

  - CVE-2016-2519, boo#977458: ctl_getitem() return value     not always checked.

  - integrate ntp-fork.patch

  - Improve the fixes for: CVE-2015-7704, CVE-2015-7705,     CVE-2015-7974

  - Restrict the parser in the startup script to the first     occurrance of 'keys' and 'controlkey' in ntp.conf     (boo#957226).

  - Enable compile-time support for MS-SNTP     (--enable-ntp-signd). This replaces the w32 patches in     4.2.4 that added the authreg directive. (fate#320758).

  - Fix ntp-sntp-dst.patch (boo#975496).

  - Call /usr/sbin/sntp with full path to synchronize in     start-ntpd. When run as cron job, /usr/sbin/ is not in     the path, which caused the synchronization to fail.
    (boo#962318)

  - Speedup ntpq (boo#782060, ntp-speedup-ntpq.patch).

  - Sync service files with openSUSE Factory.

  - Fix the TZ offset output of sntp during DST     (boo#951559).

  - Add ntp-fork.patch and build with threads disabled to     allow name resolution even when running chrooted.

  - Update to 4.2.8p6 :

  - CVE-2015-8158, boo#962966: Potential Infinite Loop in     ntpq.

  - CVE-2015-8138, boo#963002: origin: Zero Origin Timestamp     Bypass.

  - CVE-2015-7979, boo#962784: Off-path Denial of Service     (DoS) attack on authenticated broadcast mode.

  - CVE-2015-7978, boo#963000: Stack exhaustion in recursive     traversal of restriction list.

  - CVE-2015-7977, boo#962970: reslist NULL pointer     dereference.

  - CVE-2015-7976, boo#962802: ntpq saveconfig command     allows dangerous characters in filenames.

  - CVE-2015-7975, boo#962988: nextvar() missing length     check.

  - CVE-2015-7974, boo#962960: Skeleton Key: Missing key     check allows impersonation between authenticated peers.

  - CVE-2015-7973, boo#962995: Deja Vu: Replay attack on     authenticated broadcast mode.

  - CVE-2015-8140: ntpq vulnerable to replay attacks.

  - CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose     origin.

  - CVE-2015-5300, boo#951629: Small-step/Big-step.

  - Add /var/db/ntp-kod (boo#916617).

  - Add ntp-ENOBUFS.patch to limit a warning that might     happen quite a lot on loaded systems (boo#956773).

  - add ntp.bug2965.diff (boo#954982)

  - fixes regression in 4.2.8p4 update

  - Update to 4.2.8p4 to fix several security issues     (boo#951608) :

  - CVE-2015-7871: NAK to the Future: Symmetric association     authentication bypass via crypto-NAK

  - CVE-2015-7855: decodenetnum() will ASSERT botch instead     of returning FAIL on some bogus values

  - CVE-2015-7854: Password Length Memory Corruption     Vulnerability

  - CVE-2015-7853: Invalid length data provided by a custom     refclock driver could cause a buffer overflow

  - CVE-2015-7852 ntpq atoascii() Memory Corruption     Vulnerability

  - CVE-2015-7851 saveconfig Directory Traversal     Vulnerability

  - CVE-2015-7850 remote config logfile-keyfile

  - CVE-2015-7849 trusted key use-after-free

  - CVE-2015-7848 mode 7 loop counter underrun

  - CVE-2015-7701 Slow memory leak in CRYPTO_ASSOC

  - CVE-2015-7703 configuration directives 'pidfile' and     'driftfile' should only be allowed locally

  - CVE-2015-7704, CVE-2015-7705 Clients that receive a KoD     should validate the origin timestamp field

  - CVE-2015-7691, CVE-2015-7692, CVE-2015-7702 Incomplete     autokey data packet length checks

  - obsoletes ntp-memlock.patch.

  - Add a controlkey line to /etc/ntp.conf if one does not     already exist to allow runtime configuuration via ntpq.

  - Temporarily disable memlock to avoid problems due to     high memory usage during name resolution (boo#946386,     ntp-memlock.patch).

  - Use SHA1 instead of MD5 for symmetric keys (boo#905885).

  - Improve runtime configuration :

  - Read keytype from ntp.conf

  - Don't write ntp keys to syslog.

  - Fix legacy action scripts to pass on command line     arguments.

  - Remove ntp.1.gz, it wasn't installed anymore.

  - Remove ntp-4.2.7-rh-manpages.tar.gz and only keep     ntptime.8.gz. The rest is partially irrelevant,     partially redundant and potentially outdated     (boo#942587).

  - Remove 'kod' from the restrict line in ntp.conf     (boo#944300).

  - Use ntpq instead of deprecated ntpdc in start-ntpd     (boo#936327).

  - Add a controlkey to ntp.conf to make the above work.

  - Don't let 'keysdir' lines in ntp.conf trigger the 'keys'     parser.

  - Disable mode 7 (ntpdc) again, now that we don't use it     anymore.

  - Add 'addserver' as a new legacy action.

  - Fix the comment regarding addserver in ntp.conf     (boo#910063).

  - Update to version 4.2.8p3 which incorporates all     security fixes and most other patches we have so far     (fate#319040). More information on:
    http://archive.ntp.org/ntp4/ChangeLog-stable

  - Disable chroot by default (boo#926510).

  - Enable ntpdc for backwards compatibility (boo#920238).

  - Security fix: ntp-keygen may generate non-random     symmetric keys

Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs :

CVE-2015-7974

Matt Street discovered that insufficient key validation allows impersonation attacks between authenticated peers.

CVE-2015-7977 / CVE-2015-7978

Stephen Gray discovered that a NULL pointer dereference and a buffer overflow in the handling of 'ntpdc reslist' commands may result in denial of service.

CVE-2015-7979

Aanchal Malhotra discovered that if NTP is configured for broadcast mode, an attacker can send malformed authentication packets which break associations with the server for other broadcast clients.

CVE-2015-8138

Matthew van Gundy and Jonathan Gardner discovered that missing validation of origin timestamps in ntpd clients may result in denial of service.

CVE-2015-8158

Jonathan Gardner discovered that missing input sanitising in ntpq may result in denial of service.

CVE-2016-1547

Stephen Gray and Matthew van Gundy discovered that incorrect handling of crypto NAK packets my result in denial of service.

CVE-2016-1548

Jonathan Gardner and Miroslav Lichvar discovered that ntpd clients could be forced to change from basic client/server mode to interleaved symmetric mode, preventing time synchronisation.

CVE-2016-1550

Matthew van Gundy, Stephen Gray and Loganaden Velvindron discovered that timing leaks in the the packet authentication code could result in recovery of a message digest.

CVE-2016-2516

Yihan Lian discovered that duplicate IPs on 'unconfig' directives will trigger an assert.

CVE-2016-2518

Yihan Lian discovered that an OOB memory access could potentially crash ntpd.

For Debian 7 'Wheezy', these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u7.

We recommend that you upgrade your ntp packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	名稱	產品	系列	已發布	已更新	嚴重性
92357	AIX NTP v4 Advisory : ntp_advisory6.asc (IV83983) (IV83992)	Nessus	AIX Local Security Checks	2016/7/18	2026/1/30	medium
92571	Debian DSA-3629-1 : ntp - security update	Nessus	Debian Local Security Checks	2016/7/27	2026/1/30	high
93896	Ubuntu 14.04 LTS / 16.04 LTS : NTP vulnerabilities (USN-3096-1)	Nessus	Ubuntu Local Security Checks	2016/10/6	2025/9/3	high
125008	EulerOS Virtualization 3.0.1.0 : ntp (EulerOS-SA-2019-1555)	Nessus	Huawei Local Security Checks	2019/5/14	2024/5/22	high
91403	openSUSE Security Update : ntp (openSUSE-2016-649)	Nessus	SuSE Local Security Checks	2016/6/1	2021/1/19	critical
92546	Debian DLA-559-1 : ntp security update	Nessus	Debian Local Security Checks	2016/7/26	2026/1/30	high

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